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FEATURES

• Measurement of visual acuity using Snellen letters and illiterate E-chart, and Times Roman reading types.• Humanized Design: Buttons and charging holes on the bottom,making the operation smoothly.• Power: Being thinner and more exquisite by using Li battery.• Charging: Replaceable plug, able to charge both on socket and computer.• Stand: Chart can stand upright or sidelong by assembling the stands together, operating much easier. • Measuring Rope: There is a 40cm rope to help measuring exact distance between testee and chart.• Buttons: off /level 1/level 2